"Zinc is an essential trace mineral, necessary for over 100 different enzyme systems in the body. Source Naturals' zinc chelate is composed of zinc bound to amino acid s from hydrolyzed vegetable protein for easy assimilation and utilization. Since zinc and copper compete for absorption, a small amount of copper is added to promote proper zinc/copper balance. Copper sebacate (copper bound to sebacic acid) has been shown to provide superior copper absorption and utilization."